llc: Drop support for ETH_P_TR_802_2.
In the Linux kernel, the following vulnerability has been resolved: llc: Drop support for ETH_P_TR_802_2. syzbot reported an uninit-value bug below. [0] llc supports ETH_P_802_2 (0x0004) and used to support ETH_P_TR_802_2 (0x0011), and syzbot abused the latter to trigger the bug. write$tun(r0, &(0x7f0000000040)={@val={0x0, 0x11}, @val, @mpls={[], @llc={@snap={0xaa, 0x1, ')', "90e5dd"}}}}, 0x16) llc_conn_handler() initialises local variables {saddr,daddr}.mac based on skb in llc_pdu_decode_sa()/llc_pdu_decode_da() and passes them to __llc_lookup(). However, the initialisation is done only when skb->protocol is htons(ETH_P_802_2), otherwise, __llc_lookup_established() and __llc_lookup_listener() will read garbage. The missing initialisation existed prior to commit 211ed865108e ("net: delete all instances of special processing for token ring"). It removed the part to kick out the token ring stuff but forgot to close the door allowing ETH_P_TR_802_2 packets to sneak into llc_rcv(). Let's remove llc_tr_packet_type and complete the deprecation. [0]: BUG: KMSAN: uninit-value in __llc_lookup_established+0xe9d/0xf90 __llc_lookup_established+0xe9d/0xf90 __llc_lookup net/llc/llc_conn.c:611 [inline] llc_conn_handler+0x4bd/0x1360 net/llc/llc_conn.c:791 llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206 __netif_receive_skb_one_core net/core/dev.c:5527 [inline] __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5641 netif_receive_skb_internal net/core/dev.c:5727 [inline] netif_receive_skb+0x58/0x660 net/core/dev.c:5786 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555 tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x8ef/0x1490 fs/read_write.c:584 ksys_write+0x20f/0x4c0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x93/0xd0 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Local variable daddr created at: llc_conn_handler+0x53/0x1360 net/llc/llc_conn.c:783 llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206 CPU: 1 PID: 5004 Comm: syz-executor994 Not tainted 6.6.0-syzkaller-14500-g1c41041124bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
- Published
- Mar 18, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 14th percentile
- CWE
- CWE-909
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux10.0
- linux linux kernel4.20 and later · before 5.4.269
- linux linux kernel5.5 and later · before 5.10.210
- linux linux kernel5.11 and later · before 5.15.149
- linux linux kernel3.5 and later · before 4.19.307
- linux linux kernel6.2 and later · before 6.6.15
- linux linux kernel6.7 and later · before 6.7.3
- linux linux kernel5.16 and later · before 6.1.76
- linux linux kernel6.8
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 3.5affected
- 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before 165ad1e22779685c3ed3dd349c6c4c632309cc62affected · git
- 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before b8e8838f82f332ae80c643dbb1ca4418d0628097affected · git
- 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before 9ccdef19cf9497c2803b005369668feb91cacdfdaffected · git
- 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before c0fe2fe7a5a291dfcf6dc64301732c8d3dc6a828affected · git
- 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before 660c3053d992b68fee893a0e9ec9159228cffdc6affected · git
- 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before f1f34a515fb1e25e85dee94f781e7869ae351fb8affected · git
- 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before df57fc2f2abf548aa889a36ab0bdcc94a75399dcaffected · git
- 211ed865108e24697b44bee5daac502ee6bdd4a4 and later · before e3f9bed9bee261e3347131764e42aeedf1ffea61affected · git
- before 3.5not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.76-1 | 6.1.76-1 |
| Debian:13 | linux | before 6.6.15-1 | 6.6.15-1 |
| openSUSE:Leap 15.6 | dtb-aarch64 | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| openSUSE:Leap 15.6 | kernel-debug | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| openSUSE:Leap 15.6 | kernel-kvmsmall | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| openSUSE:Leap 15.6 | kernel-obs-qa | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_3 | before 1-150600.13.3.1 | 1-150600.13.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_3 | before 1-150600.13.3.1 | 1-150600.13.3.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-64kb | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-64kb | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-default | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-default | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-default-base | before 6.4.0-150600.23.17.1.150600.12.6.2 | 6.4.0-150600.23.17.1.150600.12.6.2 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-default-base | before 6.4.0-150600.23.17.1.150600.12.6.2 | 6.4.0-150600.23.17.1.150600.12.6.2 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-source | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-source | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-zfcpdump | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-zfcpdump | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP6 | kernel-docs | before 6.4.0-150600.23.17.3 | 6.4.0-150600.23.17.3 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP6 | kernel-docs | before 6.4.0-150600.23.17.3 | 6.4.0-150600.23.17.3 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP6 | kernel-obs-build | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP6 | kernel-obs-build | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP6 | kernel-syms | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP6 | kernel-syms | before 6.4.0-150600.23.17.1 | 6.4.0-150600.23.17.1 |
+4
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
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Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 165ad1e22779685c3ed3dd349c6c4c632309cc62 | Vendor (CNA) |
| Linux Linux | 660c3053d992b68fee893a0e9ec9159228cffdc6 | Vendor (CNA) |
| Linux Linux | 9ccdef19cf9497c2803b005369668feb91cacdfd | Vendor (CNA) |
| Linux Linux | b8e8838f82f332ae80c643dbb1ca4418d0628097 | Vendor (CNA) |
| Linux Linux | c0fe2fe7a5a291dfcf6dc64301732c8d3dc6a828 | Vendor (CNA) |
| Linux Linux | df57fc2f2abf548aa889a36ab0bdcc94a75399dc | Vendor (CNA) |
| Linux Linux | e3f9bed9bee261e3347131764e42aeedf1ffea61 | Vendor (CNA) |
| Linux Linux | f1f34a515fb1e25e85dee94f781e7869ae351fb8 | Vendor (CNA) |
| debian:linux | 6.1.76-1 · Debian:12 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 6.4.0-150600.23.17.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-64kb | 6.4.0-150600.23.17.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-debug | 6.4.0-150600.23.17.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| suse:kernel-64kb | 6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-default | 6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-default-base | 6.4.0-150600.23.17.1.150600.12.6.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-docs | 6.4.0-150600.23.17.3 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_3 | 1-150600.13.3.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-obs-build | 6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
| suse:kernel-rt | 4.12.14-10.194.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kernel-rt_debug | 4.12.14-10.194.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kernel-source | 6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-source-rt | 4.12.14-10.194.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kernel-syms | 6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
| suse:kernel-syms-rt | 4.12.14-10.194.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kernel-zfcpdump | 6.4.0-150600.23.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2024-43873155 days apartvhost/vsock: always initialize seqpacket_allow31Monitor
- CVE-2022-49865409 days apartipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network28Monitor
- CVE-2022-50169457 days apartwifi: wil6210: debugfs: fix info leak in wil_write_file_wmi()28Monitor
- CVE-2024-50076224 days apartvt: prevent kernel-infoleak in con_font_get()26Monitor
- CVE-2024-56676285 days apartthermal: testing: Initialize some variables annoteded with _free()22Monitor
- CVE-2022-49217345 days apartscsi: pm8001: Fix abort all task initialization22Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-24-0494 · May 16, 2024(Linux Kernel Güncellemesi)
- TR-24-0205 · Mar 20, 2024(Linux Kernel Güncellemesi)
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-909 · Missing Initialization of ResourceCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/165ad1e22779685c3ed3dd349c6c4c632309cc62
- git.kernel.org/stable/c/660c3053d992b68fee893a0e9ec9159228cffdc6
- git.kernel.org/stable/c/9ccdef19cf9497c2803b005369668feb91cacdfd
- git.kernel.org/stable/c/b8e8838f82f332ae80c643dbb1ca4418d0628097
- git.kernel.org/stable/c/c0fe2fe7a5a291dfcf6dc64301732c8d3dc6a828
- git.kernel.org/stable/c/df57fc2f2abf548aa889a36ab0bdcc94a75399dc
- git.kernel.org/stable/c/e3f9bed9bee261e3347131764e42aeedf1ffea61
- git.kernel.org/stable/c/f1f34a515fb1e25e85dee94f781e7869ae351fb8
- lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.